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<pre><span class="sourceLineNo">001</span><a name="line.1"></a>
<span class="sourceLineNo">002</span>/*<a name="line.2"></a>
<span class="sourceLineNo">003</span> * Copyright (C) 2014 Archie L. Cobbs. All rights reserved.<a name="line.3"></a>
<span class="sourceLineNo">004</span> *<a name="line.4"></a>
<span class="sourceLineNo">005</span> * $Id: ObjIdSet.html 842 2015-03-07 18:20:42Z archie.cobbs $<a name="line.5"></a>
<span class="sourceLineNo">006</span> */<a name="line.6"></a>
<span class="sourceLineNo">007</span><a name="line.7"></a>
<span class="sourceLineNo">008</span>package org.jsimpledb.util;<a name="line.8"></a>
<span class="sourceLineNo">009</span><a name="line.9"></a>
<span class="sourceLineNo">010</span>import java.util.AbstractSet;<a name="line.10"></a>
<span class="sourceLineNo">011</span>import java.util.Iterator;<a name="line.11"></a>
<span class="sourceLineNo">012</span><a name="line.12"></a>
<span class="sourceLineNo">013</span>import org.jsimpledb.core.ObjId;<a name="line.13"></a>
<span class="sourceLineNo">014</span><a name="line.14"></a>
<span class="sourceLineNo">015</span>/**<a name="line.15"></a>
<span class="sourceLineNo">016</span> * A set of {@link ObjId}s.<a name="line.16"></a>
<span class="sourceLineNo">017</span> *<a name="line.17"></a>
<span class="sourceLineNo">018</span> * &lt;p&gt;<a name="line.18"></a>
<span class="sourceLineNo">019</span> * This implementation is space optimized for the 64-bits of information contained in an {@link ObjId}.<a name="line.19"></a>
<span class="sourceLineNo">020</span> * Instances do not accept null values and are not thread safe.<a name="line.20"></a>
<span class="sourceLineNo">021</span> * &lt;/p&gt;<a name="line.21"></a>
<span class="sourceLineNo">022</span> */<a name="line.22"></a>
<span class="sourceLineNo">023</span>public class ObjIdSet extends AbstractSet&lt;ObjId&gt; implements Cloneable {<a name="line.23"></a>
<span class="sourceLineNo">024</span><a name="line.24"></a>
<span class="sourceLineNo">025</span>    private /*final*/ ObjIdMap&lt;?&gt; map;<a name="line.25"></a>
<span class="sourceLineNo">026</span><a name="line.26"></a>
<span class="sourceLineNo">027</span>// Constructors<a name="line.27"></a>
<span class="sourceLineNo">028</span><a name="line.28"></a>
<span class="sourceLineNo">029</span>    /**<a name="line.29"></a>
<span class="sourceLineNo">030</span>     * Constructs an empty instance.<a name="line.30"></a>
<span class="sourceLineNo">031</span>     */<a name="line.31"></a>
<span class="sourceLineNo">032</span>    public ObjIdSet() {<a name="line.32"></a>
<span class="sourceLineNo">033</span>        this(0);<a name="line.33"></a>
<span class="sourceLineNo">034</span>    }<a name="line.34"></a>
<span class="sourceLineNo">035</span><a name="line.35"></a>
<span class="sourceLineNo">036</span>    /**<a name="line.36"></a>
<span class="sourceLineNo">037</span>     * Constructs an instance with the given initial capacity.<a name="line.37"></a>
<span class="sourceLineNo">038</span>     *<a name="line.38"></a>
<span class="sourceLineNo">039</span>     * @param capacity initial capacity<a name="line.39"></a>
<span class="sourceLineNo">040</span>     * @throws IllegalArgumentException if {@code capacity} is negative<a name="line.40"></a>
<span class="sourceLineNo">041</span>     */<a name="line.41"></a>
<span class="sourceLineNo">042</span>    public ObjIdSet(int capacity) {<a name="line.42"></a>
<span class="sourceLineNo">043</span>        this(new ObjIdMap&lt;Void&gt;(capacity, false));<a name="line.43"></a>
<span class="sourceLineNo">044</span>    }<a name="line.44"></a>
<span class="sourceLineNo">045</span><a name="line.45"></a>
<span class="sourceLineNo">046</span>    /**<a name="line.46"></a>
<span class="sourceLineNo">047</span>     * Constructs an instance initialized with the given ID's.<a name="line.47"></a>
<span class="sourceLineNo">048</span>     *<a name="line.48"></a>
<span class="sourceLineNo">049</span>     * @param ids initial contents for this instance<a name="line.49"></a>
<span class="sourceLineNo">050</span>     * @throws IllegalArgumentException if {@code ids} is null<a name="line.50"></a>
<span class="sourceLineNo">051</span>     * @throws NullPointerException if any ID in {@code ids} is null<a name="line.51"></a>
<span class="sourceLineNo">052</span>     */<a name="line.52"></a>
<span class="sourceLineNo">053</span>    public ObjIdSet(Iterable&lt;? extends ObjId&gt; ids) {<a name="line.53"></a>
<span class="sourceLineNo">054</span>        this(0);<a name="line.54"></a>
<span class="sourceLineNo">055</span>        if (ids == null)<a name="line.55"></a>
<span class="sourceLineNo">056</span>            throw new IllegalArgumentException("null ids");<a name="line.56"></a>
<span class="sourceLineNo">057</span>        for (ObjId id : ids)<a name="line.57"></a>
<span class="sourceLineNo">058</span>            this.add(id);<a name="line.58"></a>
<span class="sourceLineNo">059</span>    }<a name="line.59"></a>
<span class="sourceLineNo">060</span><a name="line.60"></a>
<span class="sourceLineNo">061</span>    // Internal constructor<a name="line.61"></a>
<span class="sourceLineNo">062</span>    ObjIdSet(ObjIdMap&lt;?&gt; map) {<a name="line.62"></a>
<span class="sourceLineNo">063</span>        this.map = map;<a name="line.63"></a>
<span class="sourceLineNo">064</span>    }<a name="line.64"></a>
<span class="sourceLineNo">065</span><a name="line.65"></a>
<span class="sourceLineNo">066</span>// Methods<a name="line.66"></a>
<span class="sourceLineNo">067</span><a name="line.67"></a>
<span class="sourceLineNo">068</span>    @Override<a name="line.68"></a>
<span class="sourceLineNo">069</span>    public Iterator&lt;ObjId&gt; iterator() {<a name="line.69"></a>
<span class="sourceLineNo">070</span>        return new Iterator&lt;ObjId&gt;() {<a name="line.70"></a>
<span class="sourceLineNo">071</span><a name="line.71"></a>
<span class="sourceLineNo">072</span>            private final ObjIdMap&lt;?&gt;.EntrySetIterator entryIterator = ObjIdSet.this.map.new EntrySetIterator();<a name="line.72"></a>
<span class="sourceLineNo">073</span><a name="line.73"></a>
<span class="sourceLineNo">074</span>            @Override<a name="line.74"></a>
<span class="sourceLineNo">075</span>            public boolean hasNext() {<a name="line.75"></a>
<span class="sourceLineNo">076</span>                return this.entryIterator.hasNext();<a name="line.76"></a>
<span class="sourceLineNo">077</span>            }<a name="line.77"></a>
<span class="sourceLineNo">078</span><a name="line.78"></a>
<span class="sourceLineNo">079</span>            @Override<a name="line.79"></a>
<span class="sourceLineNo">080</span>            public ObjId next() {<a name="line.80"></a>
<span class="sourceLineNo">081</span>                return this.entryIterator.next().getKey();<a name="line.81"></a>
<span class="sourceLineNo">082</span>            }<a name="line.82"></a>
<span class="sourceLineNo">083</span><a name="line.83"></a>
<span class="sourceLineNo">084</span>            @Override<a name="line.84"></a>
<span class="sourceLineNo">085</span>            public void remove() {<a name="line.85"></a>
<span class="sourceLineNo">086</span>                this.entryIterator.remove();<a name="line.86"></a>
<span class="sourceLineNo">087</span>            }<a name="line.87"></a>
<span class="sourceLineNo">088</span>        };<a name="line.88"></a>
<span class="sourceLineNo">089</span>    }<a name="line.89"></a>
<span class="sourceLineNo">090</span><a name="line.90"></a>
<span class="sourceLineNo">091</span>    @Override<a name="line.91"></a>
<span class="sourceLineNo">092</span>    public int size() {<a name="line.92"></a>
<span class="sourceLineNo">093</span>        return this.map.size();<a name="line.93"></a>
<span class="sourceLineNo">094</span>    }<a name="line.94"></a>
<span class="sourceLineNo">095</span><a name="line.95"></a>
<span class="sourceLineNo">096</span>    @Override<a name="line.96"></a>
<span class="sourceLineNo">097</span>    public boolean isEmpty() {<a name="line.97"></a>
<span class="sourceLineNo">098</span>        return this.map.isEmpty();<a name="line.98"></a>
<span class="sourceLineNo">099</span>    }<a name="line.99"></a>
<span class="sourceLineNo">100</span><a name="line.100"></a>
<span class="sourceLineNo">101</span>    @Override<a name="line.101"></a>
<span class="sourceLineNo">102</span>    public boolean contains(Object obj) {<a name="line.102"></a>
<span class="sourceLineNo">103</span>        return this.map.containsKey(obj);<a name="line.103"></a>
<span class="sourceLineNo">104</span>    }<a name="line.104"></a>
<span class="sourceLineNo">105</span><a name="line.105"></a>
<span class="sourceLineNo">106</span>    @Override<a name="line.106"></a>
<span class="sourceLineNo">107</span>    public boolean add(ObjId id) {<a name="line.107"></a>
<span class="sourceLineNo">108</span>        if (this.map.containsKey(id))<a name="line.108"></a>
<span class="sourceLineNo">109</span>            return false;<a name="line.109"></a>
<span class="sourceLineNo">110</span>        this.map.put(id, null);<a name="line.110"></a>
<span class="sourceLineNo">111</span>        return true;<a name="line.111"></a>
<span class="sourceLineNo">112</span>    }<a name="line.112"></a>
<span class="sourceLineNo">113</span><a name="line.113"></a>
<span class="sourceLineNo">114</span>    @Override<a name="line.114"></a>
<span class="sourceLineNo">115</span>    public boolean remove(Object obj) {<a name="line.115"></a>
<span class="sourceLineNo">116</span>        if (!this.map.containsKey(obj))<a name="line.116"></a>
<span class="sourceLineNo">117</span>            return false;<a name="line.117"></a>
<span class="sourceLineNo">118</span>        this.map.remove(obj);<a name="line.118"></a>
<span class="sourceLineNo">119</span>        return true;<a name="line.119"></a>
<span class="sourceLineNo">120</span>    }<a name="line.120"></a>
<span class="sourceLineNo">121</span><a name="line.121"></a>
<span class="sourceLineNo">122</span>    @Override<a name="line.122"></a>
<span class="sourceLineNo">123</span>    public void clear() {<a name="line.123"></a>
<span class="sourceLineNo">124</span>        this.map.clear();<a name="line.124"></a>
<span class="sourceLineNo">125</span>    }<a name="line.125"></a>
<span class="sourceLineNo">126</span><a name="line.126"></a>
<span class="sourceLineNo">127</span>    /**<a name="line.127"></a>
<span class="sourceLineNo">128</span>     * Produce a debug dump of this instance.<a name="line.128"></a>
<span class="sourceLineNo">129</span>     */<a name="line.129"></a>
<span class="sourceLineNo">130</span>    String debugDump() {<a name="line.130"></a>
<span class="sourceLineNo">131</span>        return this.map.debugDump();<a name="line.131"></a>
<span class="sourceLineNo">132</span>    }<a name="line.132"></a>
<span class="sourceLineNo">133</span><a name="line.133"></a>
<span class="sourceLineNo">134</span>// Object<a name="line.134"></a>
<span class="sourceLineNo">135</span><a name="line.135"></a>
<span class="sourceLineNo">136</span>    // This works because ObjId.hashCode() == ObjId.asLong().hashCode()<a name="line.136"></a>
<span class="sourceLineNo">137</span>    @Override<a name="line.137"></a>
<span class="sourceLineNo">138</span>    public int hashCode() {<a name="line.138"></a>
<span class="sourceLineNo">139</span>        final long[] keyArray = this.map.getKeys();<a name="line.139"></a>
<span class="sourceLineNo">140</span>        int hash = 0;<a name="line.140"></a>
<span class="sourceLineNo">141</span>        for (int i = 0; i &lt; keyArray.length; i++) {<a name="line.141"></a>
<span class="sourceLineNo">142</span>            final long key = keyArray[i];<a name="line.142"></a>
<span class="sourceLineNo">143</span>            if (key != 0)<a name="line.143"></a>
<span class="sourceLineNo">144</span>                hash += (int)(key &gt;&gt;&gt; 32) ^ (int)key;<a name="line.144"></a>
<span class="sourceLineNo">145</span>        }<a name="line.145"></a>
<span class="sourceLineNo">146</span>        return hash;<a name="line.146"></a>
<span class="sourceLineNo">147</span>    }<a name="line.147"></a>
<span class="sourceLineNo">148</span><a name="line.148"></a>
<span class="sourceLineNo">149</span>// Cloneable<a name="line.149"></a>
<span class="sourceLineNo">150</span><a name="line.150"></a>
<span class="sourceLineNo">151</span>    @Override<a name="line.151"></a>
<span class="sourceLineNo">152</span>    public ObjIdSet clone() {<a name="line.152"></a>
<span class="sourceLineNo">153</span>        final ObjIdSet clone;<a name="line.153"></a>
<span class="sourceLineNo">154</span>        try {<a name="line.154"></a>
<span class="sourceLineNo">155</span>            clone = (ObjIdSet)super.clone();<a name="line.155"></a>
<span class="sourceLineNo">156</span>        } catch (CloneNotSupportedException e) {<a name="line.156"></a>
<span class="sourceLineNo">157</span>            throw new RuntimeException(e);<a name="line.157"></a>
<span class="sourceLineNo">158</span>        }<a name="line.158"></a>
<span class="sourceLineNo">159</span>        clone.map = clone.map.clone();<a name="line.159"></a>
<span class="sourceLineNo">160</span>        return clone;<a name="line.160"></a>
<span class="sourceLineNo">161</span>    }<a name="line.161"></a>
<span class="sourceLineNo">162</span>}<a name="line.162"></a>
<span class="sourceLineNo">163</span><a name="line.163"></a>




























































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